// 获取滚动条当前的位置
export default function isLoadMore() {
  if (getScrollTop() + getClientHeight() === getScrollHeight()) {
    return true
  }
  return false
}

function getScrollTop() {
  var scrollTop = 0
  if (document.documentElement && document.documentElement.scrollTop) {
    scrollTop = document.documentElement.scrollTop
  } else if (document.body) {
    scrollTop = document.body.scrollTop
  }
  return scrollTop
}

// 获取当前可视范围的高度
function getClientHeight() {
  var clientHeight = 0
  if (document.body.clientHeight && document.documentElement.clientHeight) {
    clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight)
  } else {
    clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight)
  }
  return clientHeight
}

// 获取文档完整的高度
function getScrollHeight() {
  return Math.max(document.body.scrollHeight, document.documentElement.scrollHeight)
}
